Cadwallon
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Cadwallon is a Welsh name, derived from an earlier Old Welsh version of the same name spelled Caswallawn. The name honours Cassivelaunus who was the pre-Roman king of the British Catuvellauni tribe who successfully resisted the Romans in 55BC and was borne in his memory by two kings of Gwynedd:
- Cadwallon Lawhir ap Einion, reigned early 6th century
- Cadwallon ap Cadfan, reigned early 7th century